I’m Helen from Shopify Support. I’m happy to help you out with this.
When did you uninstall the Stamped.io Reviews app? I can see from your screenshot, that the billing period for that app was May 14 - June 13, so there won’t be any further charges for it after this billing period.
However, since this app is a third party app, the charge cannot be removed from your current invoice. If you are wanting a refund or credit for it, please contact the app developer directly to request this. For more information on this process, please refer to our Help Doc on Requesting a refund or credit for an app purchase.
Hope this helps! Let me know if you have any further questions.